<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        body {
            display: flex;
            justify-content: center;
            align-items: center;
            height: 100vh;
            overflow: hidden;
        }
        .container {
            width: 90%;
            height: 90%;
            /*background: #b0b0b0;*/
        }
        .aside {
            width: 200px;
            height: 100%;
            background: linear-gradient(to bottom, #333, #666);
            padding: 20px 0;
            -webkit-box-sizing: border-box;
            -moz-box-sizing: border-box;
            box-sizing: border-box;
            float: left;
            border-radius: 20px 0 0 20px;
        }
        .aside a {
            display: block;
            width: 100%;
            height: 60px;
            text-align: center;
            line-height: 60px;
            text-decoration: none;
            color: #b0b0b0;
        }
        .aside a:hover {
            background: #ff6700;
            color: #fff;
        }
        .main {
            height: 100%;
            background: #eaf3f6;
            width: calc(100% - 200px);
            float: left;
            border-radius: 0 20px 20px 0;
        }
    </style>
</head>
<body>
    <div class="container">
        <div class="aside">
            <a href="./home.html" target="iframeBox">首页</a>
            <a href="./user.html" target="iframeBox">用户管理</a>
            <a href="./product.html" target="iframeBox">商品管理</a>
        </div>
        <div class="main">
            <iframe src="home.html" name="iframeBox" frameborder="0" width="100%" height="100%" scrolling="yes"></iframe>
        </div>
    </div>
</body>
</html>